Oilpan: fix build after r187345.

Source/core/animation/css/CSSAnimations.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 97 matching lines @@
 
         AtomicString name;
         RefPtrWillBeMember<InertAnimation> animation;
     };
 
     struct UpdatedAnimationTiming {
         ALLOW_ONLY_INLINE_ALLOCATION();
     public:
         void trace(Visitor* visitor)
         {
+            visitor->trace(player);
             visitor->trace(animation);
         }
 
         RawPtrWillBeMember<AnimationPlayer> player;
         RefPtrWillBeMember<InertAnimation> animation;
         Timing newTiming;
     };
 
     const WillBeHeapVector<NewAnimation>& newAnimations() const { return m_newAnimations; }
     const Vector<AtomicString>& cancelledAnimationNames() const { return m_cancelledAnimationNames; }
@@ skipping 84 matching lines @@
     void cancel();
 
     void trace(Visitor*);
 
 private:
     struct RunningTransition {
         ALLOW_ONLY_INLINE_ALLOCATION();
     public:
         void trace(Visitor* visitor)
         {
+            visitor->trace(player);
             visitor->trace(from);
             visitor->trace(to);
-            visitor->trace(player);
         }
 
         RefPtrWillBeMember<AnimationPlayer> player;
         RawPtrWillBeMember<const AnimatableValue> from;
         RawPtrWillBeMember<const AnimatableValue> to;
     };
 
     using AnimationMap = WillBeHeapHashMap<AtomicString, RefPtrWillBeMember<AnimationPlayer>>;
     AnimationMap m_animations;
 
@@ skipping 45 matching lines @@
     private:
         RawPtrWillBeMember<Element> m_target;
         const CSSPropertyID m_property;
         AnimationNode::Phase m_previousPhase;
     };
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::NewAnimation);
+WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::UpdatedAnimationTiming);
 
 #endif